Why are x86 tablets game changers though? They have been around for years. They are only getting traction now because of Metro - which is basically Windows RT. Windows tablet NEVER got anywhere because they didn't work well with touch, needs fans/cooling too thick too heavy etc like the surface pro still is.
Windows RT offers two things - a clean break from all those troublesome malware, virus, toolbar ad ons, etc. They offer a touch first experience for tablets, think fanless design, better GPU for gaming than the atom chips. Etc
What x86 app do you want to install on a 8inch tablet like the Dell Venue 8 pro?
spinedoc hit the nail on the head... it's just about on par with ARM when it comes to packaging, battery life, performance and so on. Unlike what you wrote, Bay Trail is fanless, no battery compromises, no performance penalties, not thicker or heavier and so on. Except for one thing: when you want to run a native Windows app, you can.
As far as malware and so on... you're missing the point. For someone who wants laptop functionality
sometimes and tablet experience most of the time it's perfect. Why have a tablet and a laptop when you can kill two birds with one stone for the same price?
The Dell Venue 8 Pro example is a perfect one. You'd use it as a tablet when you're on the go and when you're at home and need productivity, plug it into your USB hub with a monitor, keyboard and mouse and all of the sudden you have a desktop. When I'm traveling this would be perfect, even if using a native app isn't perfect on an 8" screen, you can use a stylus and get by.
Let me give you a simple example of why I'm considering buying one. When I'm racing and use a GoPro & QStarz (among other instrumentation), I can review everything without lugging a laptop. If I want to take the GoPro video and throw it into Movie Maker for some quick editing and upload it to YouTube, no problem. This is something I CAN"T do with a tablet, both iOS and Android. QStarz has no software for these devices and the movie editing software is extremely limited.
Here's another: when I go on vacation I don't need to lug around a laptop with me, if I have the power of a tablet and a laptop in one. 99% I really just need a tablet but bring the laptop with me just in case.
If you like to remote into your home or office and require certain VPN software... install it and RDP into your machine.
If you're used to working in Photoshop, GIMP or Paint.NET and need some advanced features while you're on the road... booyah.
I'm sure there are a million uses. That's the reason we all have laptops. A tablet is a secondary device. With the "Windows Pro" tablets it can be both.